package com.teacher.web;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.common.model.BaseUser;

/**
 * Servlet Filter implementation class LoginFilter
 */
@WebFilter("/teacher/*")
public class LoginFilter implements Filter {

    /**
     * Default constructor. 
     */
    public LoginFilter() {
    }

	/**
	 * @see Filter#destroy()
	 */
	public void destroy() {
		// TODO Auto-generated method stub
	}

	/**
	 * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
	 */
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		HttpServletRequest req = (HttpServletRequest)request;
		HttpServletResponse res = (HttpServletResponse)response;
		BaseUser user = (BaseUser)req.getSession().getAttribute("user");
		if(user == null){
			res.sendRedirect(req.getContextPath());
			return;
		}
		else if(!"teacher".equals(user.getUserType()))
		{
			res.sendRedirect(req.getContextPath());
			return;
		}else{
			chain.doFilter(request, response);
		}

		// pass the request along the filter chain
	}

	/**
	 * @see Filter#init(FilterConfig)
	 */
	public void init(FilterConfig fConfig) throws ServletException {
		// TODO Auto-generated method stub
	}

}
